The Tuya River is a major tributary of the Stikine River in northwest part of the province of British Columbia, Canada. From its source at High Tuya Lake in Tuya Mountains Provincial Park just south of Ash Mountain, the highest peak of the Tuya Range, the Tuya River flows south about to meet the Stikine River in the Grand Canyon of the Stikine. The Tuya River's main tributary is the Little Tuya River. The Tuya River divides the Tanzilla Plateau on the east from the Kawdy Plateau, to the northwest, and the Nahlin Plateau, to the southwest. All three are considered sub-plateaus of the Stikine Plateau. The Tuya River's watershed covers , and its mean annual discharge is estimated at . The mouth of the Tuya River is located about northeast of Telegraph Creek, British Columbia, about southwest of Dease Lake, British Columbia, and about east of Juneau, Alaska. The Tuya River's watershed's land cover is classified as 35.7% shrubland, 31.4% conifer forest, 14.0% mixed forest, 7.2% herbaceous, and small amounts of other cover. A tuya is a geologic term for a flat-topped, steep-sided volcano formed when lava erupts through a thick glacier or ice sheet. The geologic term comes from Tuya Butte, which was named in association with Tuya Lake. The term may come the Tahltan language. The Tuya River is in the traditional territory of the Tahltan First Nation, of the Tahltan people, the Kaska Dena First Nation, and the Teslin Tlingit First Nation. Geography The Tuya River originates at High Tuya Lake in Tuya Mountains Provincial Park, just south of Ash Mountain, the highest peak of the Tuya Range. It flows south to Tuya Lake, southeast of Tuya Butte and east of Mount Josephine. The tributary Butte Creek, flowing south from Butte Lake in Tuya Mountains Provincial Park, empties into Tuya Lake. From the southern end of Tuya Lake the Tuya River continues south. It is joined by Josephine Creek and numerous unnamed tributaries. Continuing south the Tuya River flows east of Tachilta Lakes, collecting more tributaries including Cody Creek, Tachilta Creek, Mckessock Creek, and Ross Creek. A few kilometres west of Cariboo Meadows the Tuya River is joined by its main tributary, the Little Tuya River. As the river nears the Stikine River it is joined by Classy Creek, then flows under Telegraph Creek Road. The Tuya River empties into the Stikine River near Days Ranch,